Questions tagged [inverse-kinematics]

For questions about using IK in rigging. Inverse Kinematics is the opposite of the default Forward Kinematics. Instead of posing each bone in a chain from the base to the tip, IK solves the rotations of preceding bone(s) in the chain automatically based on the position of the IK-constrained bone.

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1answer
389 views

Stretching model with ik makes model bigger

How can I get rid of this when I move my bone? Because I would like it to only stretch, but not get bigger. I have stretch enabled in the ik panel. It's the thigh that has the stretch enabled on it ...
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1answer
4k views

Keep rig feet flat on the ground (IK Rig)

So I have an IK rig setup; however, when I move the pelvis down to make the character squat the feet fall through the ground. e.g. How can I set it up so that when I move the pelvis down the feet ...
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1answer
179 views

Belly deforming when moving hand!

For some reason moving the hand deforms the belly: However, there are no weights in that area, or at least none strong enough to cause the deformation I see: This is how it appears normally (at rest ...
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1answer
140 views

Spline IK Bake Pose

How can the Blender User get the desired visual results for Bake below? Legend for image above. The letter A is next to a selected Armature which henceforth, for brevity, will be named [A]. The ...
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1answer
3k views

How to put all armature bones under 1 root bone

i have downloaded many arm rigs for my first person project in UE4. UE4 only allows for one root bone when importing. All of the arm rigs i have downloaded have many bones, rather than being children ...
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1answer
155 views

Was Y-Axis IK Stretching removed in 2.79 RC2?

The stretching I'm referring to is the slider seen here in the IK Constraints settings for individual bones, not the "Stretch To" constraint: A while back (a little under a year ago now I think), I ...
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0answers
180 views

Disable IK effect for a model's certain animations (and keep for the rest)

I have a question set in the title - I have a model where I use an IK structure to affect maniopulation with 2 handed weapon, it works the way to match the top hand of an imitated weapon in the ...
2
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1answer
427 views

IK rigged elbows have unexpected “laggy” or “jumpy” behaviour when animated

To keep this both as short and as informative as I can: The character I'm animating has bones in his arms set up like this: The lower arm has a regular IK constraint with a hand controller as a ...
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0answers
252 views

Inverse Kinematics odd behaviour

I have rigged an ant by parenting each bone of armature and then parenting every ant part to its corresponding bone. For animation purposes i have created empty objects in the ant's feet position and ...
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1answer
749 views

Make Human to Blender with IK doesn't work as expected

I'm exporting the character from MakeHuman with the MHX format with a rig "CMU mb" or the "Game Engine". Then I imported the file to blender overriding the exported data and selecting the MHX as the ...
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1answer
319 views

Can I prevent a specific bone from moving during Auto-IK posing?

Can I limit chain length during Auto-IK posing, or otherwise prevent the movement of specific bones? I'm familiar with the ability to limit chain length when setting IK bone constraints, but I don't ...
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1answer
1k views

Adding Armour to Rig

So I have a model of the Master Chief (Halo 5) that I downloaded from the internet, and I constructed a rig for him. The rig works fine But when I add the armour to the rig I get bad distortion (...
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87 views

Is it possible to get a list of sub-layouts from a self.layout and insert buttons on it?

I'd like to write an operator to set the correct pole angle for IKs, so adding a pole target won't move the rig. As I'd like to add a button next to the pole angle property field in the UI, found out ...
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0answers
416 views

I want to make this eye blink

I have modeled a little doggy and I wanna make her eyes blink. What I have created are two quarter spheres that set at the back of the eye behind the mesh to roll on the x-axis over the eyeball. I ...
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1answer
977 views

IK local rotation locking

I have an IK chain, and there are some axes that I don't want some bones to rotate around. So I go to the bone tab, scroll down to Inverse Kinematics, and lock the axes I don't want the bone to rotate ...
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1answer
305 views

Inverse Kinematics Documentation

I am currently writing a thesis and for the practical part I use blender to simulate something with the Blender IK Solver ( and iTaSC). Are there books etc about the implementation or the usage of the ...
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1answer
3k views

How do you lock the rotation of a bone in an IK chain?

How can you make an IK chain of bones where one of the bones does not rotate relative to it's parent bone but is still part of the IK chain? Specific example: I have this simple arm rig with IK that ...
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0answers
232 views

Get bone rotation from IK

Is it possible to get the xyz euler rotation of the bones in an armature that is controlled by the iTaSC IK solver with python? With the rotation I mean the difference e.g. between the start and end ...
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1answer
334 views

IK show bones Degrees of Freedom

I rigged a human and now want to set the limits. I have a blue / red ring that visualizes the limits on the x and z axis but not on the y axis ( I just found out that I can deactivate them by ...
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2answers
1k views

Adding a pole target causes bones to ignore their IK constraints

I currently have a robotic arm rig with the shoulder only being able to rotate along 1 axis, and the bicep only being allowed to rotate along a different axis. I am controlling these bones with an IK ...
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1answer
2k views

Disable stretch in IK bones

I'm using the nice rig from BornCG tutorial, and when I move the hand IK targets, the arms do not stretch, however, the legs do, and I can't figure out how to prevent them from doing that.
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1answer
783 views

IK Rig (Pole Target Issue)

Hello there so i have a mesh with IK set up for the arm however as soon as i add a pole target and go back to Position moving for the IK Arm It Screws up the Mesh this only occurs after adding the ...
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0answers
373 views

My IK rigging is backwards. Twisting the mesh and pointing the wrong direction

I am an amateur rigger at best. I do not have much of a grasp on the technical side of it, so this probably seems very stupid. My rig is putting a "knot" in my mesh and will only work if the IK is ...
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3answers
5k views

What is Inverse Kinematics?

Why do we need the Inverse Kinematic constraint in rigging? What is the benefit of it, what is a situation where I can use it and what does it do to the armature?
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1answer
416 views

Blender 2.78a crashes when setting up IK system [closed]

Okay, this has wasted fifteen minutes of my entire life. I'm using Blender 2.78a with a Windows 32-bit OS. I was just following a character creation tutorial in Youtube and I made it till the end of ...
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2answers
333 views

How do I put a constraint on a bone affected by chain length?

I'm trying to figure out how to put a constraint on the shoulder bone as shown in the images below. What I'm looking for is a realistic motion where the shoulder moves upward ONLY when the arm bone ...
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0answers
93 views

Control the location of my IK bone

I've created an IK bone for my left arm of my armature. I wonder how I can control it's location to be beside the armature around the hand. As shown below, when I grab it all the way it goes far from ...
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1answer
1k views

How to switch to Inverse Kinematic for Make Human model in blender 2.78?

I exported a human in mhx2 format from MakeHuman and imported it to Blender 2.78a. What is necessary to install in blender in order to see the MHX Main panel and/or switch from FK to IK mode for ...
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1answer
2k views

IK not working properly

I did the exact same IK steps in two armatures and one of them SimpleArmature works great, but with the second one HumanArmature...
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1answer
172 views

Inverse Kinematics in BGE not working

I'm beginning in Blender and trying to create my first test game, but now I'm stuck in the creation of a aim system. Basically I created a tank model and associated an armature in it. Then, I created ...
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1answer
3k views

How can I seamlessly switch between IK/FK?

How can I switch between IK/FK without having bones changing their transformation? I have forearm bone with IK constrained. Now I want to disable IK and rotate forearm. The problem is whenever I ...
2
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1answer
203 views

Bending animation with rig?

I'm trying to make an android animation, but I am stuck at the rigging part. I want his arms and legs to be able to bend like plastic / rubber and use a rig. I've heard of lattice modifier, but that ...
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1answer
586 views

Character deforming with rigging and adding automatic weights

Im super new to blender so.. I have no idea what I'm doing wrong. I added some bones and IK and every time I add automatic weights his body gets all twisted and deformed and distorted. I tried a bunch ...
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1answer
867 views

Problem: Armature deforms mesh when after parenting

I am fairly new to Blender and recently I've been working on a new character rig from scratch. I've got the character mesh all drawn out and right now I'm learning from online tutorials on youtube on ...
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2answers
390 views

MakeHuman Inverse Kinematics

I have a makehuman model that I want to use for animating. However, with the current forward kinematics, it's very difficult to animate each bone one by one. So after messing around, I figured out how ...
3
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1answer
354 views

Mesh is deformation is mirroring very strangely, how do I fix this?

I am rigging a crossbow to be exported to Unity3D. It is currently just a model of a bow, and I am trying to perfect the rig as much as possible before I model the stock. I have been trying to fix a ...
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0answers
82 views

Inverse kinematics offset?

I have a problem with my rig. As I put a IK constrain on the two bones, the constrained one is just offsetting as shown in the screenshot below Is there anything I did wrong? Best regards
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1answer
1k views

Why is my model distorting when I weight paint?

After importing a .OBG file and rigging it, when I weight paint, my model deforms. I use Blender v2.77 .
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0answers
392 views

Strange behavior of animation constraints

In my recent rigging tests i encountered some weird behavior when using animation constraints. In this example you can see the foot is lagging some frames behind. Also if you cancel the animation, ...
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1answer
321 views

Inverse Kinematic Panel disabled from Bone tab

I cannot restrict the rotation of a Bone in Blender... I have done it on the previous project, but now it is disabled and I cannot figure out why.. Any ideas would be much appreciated, thanks.
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1answer
379 views

Model gets squished because of Spline IK

Recorded a video of the issue happening: https://youtu.be/LFoUrE1OHwQ Added a gif in case the video goes down: The head of my character gets squished when one of the controls for the Spline IK is in ...
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1answer
491 views

IK not working for legs, where am I wrong?

I'm stuck in this armature creation where IK works pretty well for harms but knees don't curve as they should.. I set same but something is not working..
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1answer
580 views

Why does this Copy Loc contraint not work with this IK bone?

I'm working on a (toy) VR kayak simulator, but have limited rigging knowledge. I'm attempting to have two IK rigged arms holding onto a paddle, so they will animate with the paddle's movement, like ...
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1answer
609 views

IK lagging behind to point at target bone

I am using Blender 2.75. So I have an armature for a pig. I used IK to have the legs always bend (a certain direction using a pole target) to connect with the target bone. I am pretty sure this is ...
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1answer
75 views

How to make an IK chain stay above another IK chain

I modeled a recurve bow and now I'm rigging it. The wooden body of the bow bends correctly. But at the start of the pulling motion the string's IK chain straightens and goes trough the tip curvature. ...
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1answer
392 views

How to maintain IK chain angle to target?

I've got a robot assembly arm (http://sendvid.com/ze9l813s) set up with an inverse kinematics solver, but I don't know how to keep the end bone from rotating. I need that bone to remain perpendicular ...
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1answer
614 views

How to make sure the final bone in an IK chain doesn't rotate?

I've got a chain of inverse kinematic a bones, and I want the one that I grab to be unable to rotate while it is moving. How do I do this? My setup is a rigged car assembly arm: http://sendvid.com/...
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2answers
2k views

How to export rigged character with ik or fk with .fbx format

I want to export my 3d modal with ik in .fbx format. I also try this with export my rigged character with .fbx format but it`s IK is not working after import it again. One more problem is ik bone ...
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2answers
678 views

IK/Posing Nightmare

I'm fairly new to blender, and I've modeled plenty of low poly models.. but this is my first time attempting to rig anything. I've been following this great video tutorial step by step, but even ...
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2answers
6k views

Worm/Tentacle/Tail/Spine Animation with ease

I wanted to rig and animate a worm using IK, so that if i move the tip of the tail i get the bend one would expect. Unfortunately using plain IK the tip will point towards the ground instead of ...